example usage
docker build . -t single_php_filehost
docker run -d -p 8080:80 \
-e SERVER_NAME=example.com \
-e MAX_FILESIZE=10 \
-e MIN_FILEAGE=1 \
-e MAX_FILEAGE=10 \
-e UPLOAD_TIMEOUT=60 \
-e ADMIN_EMAIL=noreply@example.com \
-e EXTERNAL_HOOK=/hook.sh \
-v /path/to/files:/files \
-v /path/to/hook.sh:/hook.sh \
single_php_filehost